Lock



April 11, 1961 J. M. AMMERMAN LOCK Filed May '7, 1957 NVENTOR, EEMIN Fun u w i w 5 a A r w ing operating member. ,Also .supporte was John M. Ammerman, =-Indianapolis, .Ind., assignor, by mesneassignme'nt's, to E'Spickelmier Jndustries, Int, .Inrdianapol i'lndg aeorr orationofiludiana .Fited. Ma t rl 51t n fla l"? Thisinven i n elate 1. a eekine device such .as is used for locking the' sashgof double-hung windows in closed position. It is an object of the inventionto produce a lock particularly w ell adap ted for use 'v' vith metalframed sash. Another object-of theinvention is to provide a 1 lock which, although, easilynengagedl and ..r .'eleased, v will :provide .a secure locking action Another objectlof the invention is to provide a locking device which willoppose separation of the meeting ,sa sh f railsfin a dlITeCtiQllpt-Xflehdicular to that of their' slidi ng movement. Still another object of the invention is to provide'a lockingdevice the major portions of which are concealed.

v In carrying out the invention'infits preferred forrn,v the ,meeting rails of the sashareprovided flanges which are to be-held in ,jengagement with' e'ach l "flier 1y the lockingdevice. rsupportedon a. horizontal ax;s alloif e such flange on the upper rail of the-lowersash is 7 ngfrom Lthe' upper rail of the lower s ash,, but below the aforesaid flange s a latch, member mounted ior swinging movement about axis parallelto that of the pperatmgmem er,suerriare member being adapted toQen'gage beneath the flangeontlie lower rail of the upper sash to prevent @penirig movement of the sashes. The latch member and operatingmember ,are interconnected by a link, the ends of,which afesolocated on the operating member and latch' membergaslto provide a toggle or over-center action serving to maintain the .locking .;de vice in ,locked conditi on. {lie provide the resilience necessarylto thelefiectivene ss of the toggle action referred to, the latch member is desirably made of material possessinga .degreetofelasticity', such as' nylon.

The latch member .and...the..latch engaged flan'g'eori. the

lower rail of the. uppersash..haveiinterfitting provisions.

which, when engagedin locking of -the latch, prevent a forced separation of the nie' e ng' rails in a horizontal P an A In the accompanying drawing illustrates o neembodiment of the invention:

Fig. 1 is a fragmental isometric view showing the locking device in locked position; a

Fig. 2 is a vertical section on the line 2-2 of Fig. 3 through the meeting rails and latching device;

Fig. 3 is a horizontal section on the line 33' of Fig. 2, showing the locking device in plan; v

Fig. 4 is a section on the line 4-4 of Fig. 2;

Fig. 5 is a fragmental view similar to Fig: 2 but on an enlarged scale; i

Fig. 6 is an isometric view of the latch member removed from association with its connected parts.

The window illustrated in the drawing comprises a frame 10 in which an upper sash 11 and a lower sash 13 are vertically slidable, in the manner common indoublehung windows. The upper sash 11 has a lower rail 12, conveniently formed of extruded metal and including an inwardly projecting, horizontally extending flange 14 having at its inner edge an upwardly projecting head 15.

The lower sash 13 includes an upper rail 17 which, like the rail 12, is conveniently formed of extruded metal and United States Patent 0 7 flange "18 is ahead 19 whichinterfits' with vthelip prj iisLp rovidedwithlaiielongated slot 19 the ends ,ofwhijch :receive'th'e shanlis 20lof ,twolirac'ket'members hav g dreads 21' which extend beyond .the vertical limits "0 Y lie 'IShafikQZO audfoyerlierthe "upper ,facejof the fl'atlge'lfi. I Scre'ws 21' extending upwardly throu'gh theflange 18 d fintothe heads 21'. secure the .b'racketmembe'rs mp1- 'Above" the flan e I18, the l'two' bracket mem er's re "with a press'fit tw'opivot pins 221 Whih fifojectltow id member is swingableaboutthe Iaxisof the pins 27jbet anl'inoperative position, shown in dotted lines in Fig. .2,

.rnepmemr which receives fapinfifi mounted iii-ope gs 36,infthelatchingjniember.'

.bYQSwihgingfthoperatin member 25 in the cl'ioc i so direction from ,the'Qdotted-line lpositionfto the [in l ne ,position. ".The various pins' 22, .27 34,; and .35, are so .posed'srelative. m each other that ",the latch meinber 2,978,757. Patented Apr. 11, 1961 ice .has ,a horizontal flange 1 8.Which projectswoutwardly ofthe pinqew info overlapping relation with the .fian efl tf f ,tlieu per'sash. [Extending e gthe outer e geof 15 on the flange 14 when the winfdow'is closed.

.Iriterrnediatelits extent, the flange .18 of the sash;rail 1 7 each other'arid into aligned 'openingsjina latch-operating mernber.2,5. .Below the flange .'L8,I.the .shanksoflthe braclgetmember's receive -with a press fit pins 27 .projecttoward each .other in alignedrelation and rate- .ceived in openings 28' inla latch,r',nember'2 9. Such latch ,a dgan operativefpoition, shown in full lines in-Figr:,2,j in {which it engag'es beneath the .fiange' 14 .to clamp such Jflange between thelatchf member and the flange .18 of lower: sash, as perhaps best 'illustratedinFig. 5 r Theoperating .nie'mbe'r 25'. and "latch member .219 v are .provided resp'ectivel'y ','With..notc,hes Stand 32, for'th jre- 'ception ofa vlink .3315) means of which the operating memberandlatchinember are interconnected; As shown,

suclillinkicomprises. a strip vof sheet metal. the ends of .iwhicli'a'rejrolled toformeyesone of which reeeive's' a pin .sgamoumed inlopeiiin'g's in {theoperatingrnember 25 and As will'jbe clear from. Fig. .2, the latchmember 29 may he. .movedflfrorn inoperative position to operative position such stresses hold the latch member firmly in engagement with the flange 1,4 and the operating member firmly in engagement with the upper rail of the lower sash.

Conveniently, the slight yielding of parts necessary to permit the action just described is at least largely localized in the latch member 29, which is made of elastically yieldable material. Nylon is a preferred material for the latch member,'as itpossesses adequate elasticity, wears-well, and does not create any objectionable noise when it is moved into clamping engagement with the flange 14.

To prevent,. or at least oppose, a forced separation of the two meeting sash rails in a horizontal plane, a portion of the bead 15 may be deformed toengage within the notch 32 of the latching member. Such result iscon veniently accomplished by distorting the material of the bead within the limits .of the notch 32 to form a lip 40 adapted to engage the base of the notch 32 as shown in Fig. 5, when the locking device is locked.

In most instances it will be desirable to associate with canvass? 3 Y the slot 19' some form of weather seal. Such a seal may take the form of a strip 42 of flexible rubber or like material which lies between the latching member 29 and the flange 18 and serves to close the slot 19. Such strip is slotted for passage of the link 33 and possesses su'flicient elasticity to permit one of the eyes at the end of the link to be passed through it.

In assembling and mounting the locking device, the seal strip 42 is placed on the link and the latter is connected .to the operating and latching members by inserting the pins 34 and 35. The bracket members 2021, with the pivot pins 22 and 27 pressed in place, are positioned at' the sides of the link and the pivot pins inserted into the operating and latching members. The latching member :29, the seal 42, and the shanks 20 of the bracket members are then passed through the slot 19 in the flange 18, and

jas a final step the screws 21 are put in place.

I claim as my invention: 7 1.,A lock for two sliding window sash having interlengaging first and second meeting rails provided respectively with first and second flanges which overlap each other in abutting relation when the sash are in closed position, said lock comprising a latch member pivotally mounted on said first meeting rail on an axis parallel thereto for swinging movement between a locked position in which it engages said second flange to clamp it against said first flange and a released position permitting separation of said flanges, an operating member pivo-tally mounted on said first meeting rail for swinging movement about an axis parallel to that of said latch member, the

respective axes of said latch member and'operating member lying on opposite sides of said first flange, said first flange having an'opening, a link extending through such opening, operatively interconnecting the latch member and operating member and forming therewith a toggle which assumes a locked condition as the operating member swings the latch member into its said locked position, said link being pivotally connected tosaid latch member and passing between the axis thereof and the point at which the latch member engages said second flange to a point of connection with said operating member when the latch 'from the second flange and shanks which pass through said slot at the ends thereof and projectbeyond the first flange, screws passing through said first flange and into said heads to secure the bracket members in place,'a latch member disposed between said shanks and pivotally connected thereto for swinging movement about a first axis between a locked position in which it clamps said second flange against said first flange and a released position permitting separation of the flanges, an operating member disposed between the heads of said bracket members and pivotally, connected thereto on a second axis parallel toand spaced from said first axis, said latch member and operating member being provided with aligned notches, and a link disposed in said notches and extending through said slot for operatively interconnecting said operating and latch members, both said axes and the points of connection of the link to the operating and latching members being so located that the link, the operating member, and the latch member form a toggle which assumes a locked condition as the operating member swings the latch member into its said locked position.

3. A lock for two sliding window sash having interengaging first and second meeting rails provided respectively with first and second flanges which overlap each other in abutting relation when the sash are in closed position, said first flange being provided with an elongated slot, a pair of bracket members having heads located on the opposite side of said first flange from the second flange and shanks which pass through said slot at the ends thereof and project beyond the first flange, screws passing through said first flange and into said heads to secure the bracket members in place, a latch member disposed between said shanks and pivotally connected thereto for swinging movement between a locked position in which it clamps said second flange against said first flange and a released position permitting separation of the flanges, an operating member disposed between the heads of said bracket members and pivotally connected thereto, said latch member andoperating member being provided with aligned notches, and. a link disposed in said notches and extending through said slot for operatively interconnecting said operating and latch members.

4. A lock as set forth in claim 3 with the addition that said second flange'is provided with a lip received in the notch of the latch member when the latter is in locked 7 position.

References Cited in the file of this patent v UNITED STATES PATENTS 567,621

Smith Sept. 15, 1896 1,900,936 Huttger Mar. 14, 1933 2,188,335 Claude-Mantle ...V.' Jan. .30, 1940 7 FOREIGN PATENTS 7 315,567 Great Britain July 18, 1929 337,792, nar Man a, 1936 Germany Nov. 17, 1944 

